Quick, it's a vocabulary emergency! Anyone know the word for....?

…when a person denies that they’re going to say something for the explicit purpose of calling attention to the thing they’ve claimed they aren’t going to talk about.

You know, like:

“I’m not going to say I told you so.”

I know there’s a word for it. I’ve seen it. I just can’t remember it. Help me and I swear I will commit it forever to memory this time with all the other hopelessly specific terms in my head. I’m looking at you gralloch.